Solar Panels

Lots and lots of questions asked and answered here in this forum and I still have questions. I’m looking at buying two banks batteries (use one while the other is charging) I won’t be using the air conditioner obviously but I can use fans and/or a swamp cooler instead, took the microwave out (never use one) so that’s not an issue, the other things in the M/H are the normal computer, cell phone, tablet, flat screen, antenna, radio, whatever the frig uses, water distiller, and lights (which I plan to change over to LED as soon as I figure out how) and hot curlers (don’t use hair dryers). Don’t use a coffee maker either (use a press). Will be using 2 portable oil/ceramic heaters in winter which use some electricity.

My RV is an old girl. 1986 Fleetwood Bounder (would post a picture but it won’t let me even though I’ve resized down 3 times). She’s got one deep cycle 12V battery already and I’m sure there’s an inverter in there somewhere but I think I will replace it anyway just because I don’t know how old it is etc. etc. Keep it for a backup. I’m not mounting anything on my RV. I will use a portable setup I can move around as I need to. I’m thinking if I want to live in full time, I should get 1 more 12V or 2 –4 more 6V and piggy back them. If I can get 2 banks like that and two 250W solar panels, would that be enough? If I go that route, what kind of charge controller should I get? (I also have the built in Onan generator which works still plus a 5500W portable generator as well). Thanks